Yocto 2.4

Move OpenBMC to Yocto 2.4(rocko)

Tested: Built and verified Witherspoon and Palmetto images
Change-Id: I12057b18610d6fb0e6903c60213690301e9b0c67
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/import-layers/yocto-poky/scripts/lib/wic/filemap.py b/import-layers/yocto-poky/scripts/lib/wic/filemap.py
index 1f1aacc..77e32b9 100644
--- a/import-layers/yocto-poky/scripts/lib/wic/filemap.py
+++ b/import-layers/yocto-poky/scripts/lib/wic/filemap.py
@@ -34,13 +34,9 @@
     Returns block size for file object 'file_obj'. Errors are indicated by the
     'IOError' exception.
     """
-
-    from fcntl import ioctl
-    import struct
-
     # Get the block size of the host file-system for the image file by calling
     # the FIGETBSZ ioctl (number 2).
-    binary_data = ioctl(file_obj, 2, struct.pack('I', 0))
+    binary_data = fcntl.ioctl(file_obj, 2, struct.pack('I', 0))
     return struct.unpack('I', binary_data)[0]
 
 class ErrorNotSupp(Exception):
@@ -228,7 +224,7 @@
         try:
             tmp_obj = tempfile.TemporaryFile("w+", dir=directory)
         except IOError as err:
-            raise ErrorNotSupp("cannot create a temporary in \"%s\": %s"
+            raise ErrorNotSupp("cannot create a temporary in \"%s\": %s" \
                               % (directory, err))
 
         try:
@@ -530,8 +526,18 @@
     except ErrorNotSupp:
         return FilemapSeek(image, log)
 
-def sparse_copy(src_fname, dst_fname, offset=0, skip=0, api=None):
-    """Efficiently copy sparse file to or into another file."""
+def sparse_copy(src_fname, dst_fname, skip=0, seek=0,
+                length=0, api=None):
+    """
+    Efficiently copy sparse file to or into another file.
+
+    src_fname: path to source file
+    dst_fname: path to destination file
+    skip: skip N bytes at thestart of src
+    seek: seek N bytes from the start of dst
+    length: read N bytes from src and write them to dst
+    api: FilemapFiemap or FilemapSeek object
+    """
     if not api:
         api = filemap
     fmap = api(src_fname)
@@ -539,17 +545,32 @@
         dst_file = open(dst_fname, 'r+b')
     except IOError:
         dst_file = open(dst_fname, 'wb')
-        dst_file.truncate(os.path.getsize(src_fname))
+        if length:
+            dst_size = length + seek
+        else:
+            dst_size = os.path.getsize(src_fname) + seek - skip
+        dst_file.truncate(dst_size)
 
+    written = 0
     for first, last in fmap.get_mapped_ranges(0, fmap.blocks_cnt):
         start = first * fmap.block_size
         end = (last + 1) * fmap.block_size
 
+        if skip >= end:
+            continue
+
         if start < skip < end:
-            fmap._f_image.seek(skip, os.SEEK_SET)
-        else:
-            fmap._f_image.seek(start, os.SEEK_SET)
-        dst_file.seek(offset + start, os.SEEK_SET)
+            start = skip
+
+        fmap._f_image.seek(start, os.SEEK_SET)
+
+        written += start - skip - written
+        if length and written >= length:
+            dst_file.seek(seek + length, os.SEEK_SET)
+            dst_file.close()
+            return
+
+        dst_file.seek(seek + start - skip, os.SEEK_SET)
 
         chunk_size = 1024 * 1024
         to_read = end - start
@@ -558,7 +579,14 @@
         while read < to_read:
             if read + chunk_size > to_read:
                 chunk_size = to_read - read
-            chunk = fmap._f_image.read(chunk_size)
+            size = chunk_size
+            if length and written + size > length:
+                size = length - written
+            chunk = fmap._f_image.read(size)
             dst_file.write(chunk)
-            read += chunk_size
+            read += size
+            written += size
+            if written == length:
+                dst_file.close()
+                return
     dst_file.close()